Symmetrical Pixel Puzzles

In these symmetrical colour by number pictures you are only given the numbers for half the pixels. Use symmetry to work out the rest of the numbers and so the rest of the picture.

This can also be used as an introduction to the idea of compression – if you know something about the properties of a picture you can reconstruct the image despite storing fewer numbers!

Links

For a wide range of pixel puzzles with other pictures that also include one that help practice times tables, symmetry and more, visit our main pixel puzzle page. For lots of different kinds of unplugged Christmas Computing activities visit our Christmas computing page.

Below are lots of downloadable sheets to print off, with the answers visible so you can see what the pictures are – or send kids to our “A bit of cs4fn” website where they can download them directly themselves without seeing the answers first.

Instructions

Some squares have a number that tells you the colour to colour in that square. Look up the colours in the key. Other squares have no number. Work out what colour they are by symmetry.